A thermally insulated vessel contains an ideal gas of molecular mass $M$ and ratio of specific heats $\gamma$. It is moving with speed $v$ and is suddenly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by:\\
(1) $\frac{(\gamma-1)}{2\gamma\mathrm{R}}\mathrm{Mv}^{2}\mathrm{~K}$\\
(2) $\frac{\gamma Mv^{2}}{2\mathrm{R}}\mathrm{K}$\\
(3) $\frac{(\gamma-1)}{2R}Mv^{2}K$\\
(4) $\frac{(\gamma-1)}{2(\gamma+1)R}\mathrm{Mv}^{2}\mathrm{~K}$